Portions of St. Charles and St. John the Baptist parishes are under a severe thunderstorm warning until 6:30 p.m. Monday (April 14), the Slidell office of the National Weather Service warned.

The office also issued an urban and small stream flood advisory for most of metro New Orleans south of Lake Pontchartrain until 6:45 p.m., as an approaching storm was expected to dump 1 to 3 inches of rain.

The severe thunderstorm warning included northern portions of St. Charles, including Hahnville, and southern parts of St. John, including LaPlace.

At 5:48 p.m., meteorologists tracked a severe thunderstorm capable of producing quarter-sized hail and winds of more than 60 mph located about 9 miles southwest of Edgar and moving east at 55 mph, the weather service said.

Doppler radar showed "weak rotation" within the storm, suggesting a tornado "may still develop," the service said.

By 6:18 p.m., the storm was located 7 miles north of Kenner, still moving east at 55 mph.

The flood advisory included New Orleans and Jefferson, St. Charles, St. John and St. James parishes.